Systems Analysis lectures - Week 06 29min How Data Flow Diagrams work

Week 6: Mastering Data Flow Diagrams (DFDs) in Systems Analysis Explore how information moves, transforms, and rests within an information system . In this session, we unpack the four core DFD building blocks (processes, external entities, data flows, and data stores) and demonstrate how to establish clear system boundaries using Context Diagrams (Level 0) . We then walk through hierarchical decomposition into Diagram 0 and lower-level child diagrams, examine essential balancing rules to preserve data integrity, and contrast logical versus physical DFDs to distinguish business activities from technical